septenarius

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sep·te·nar·i·us

S0273600 (sĕp′tə-nâr′ē-əs)n. pl. sep·te·nar·i·i (-ē-ī′) A Latin verse used only in comedy and consisting of seven feet, especially a catalectic iambic or trochaic tetrameter.
[Latin septēnārius, of seven, from septēnī, seven each, from septem, seven; see septennial.]

septenarius

(ˌsɛptəˈnɛərɪəs) nany line of verse containing seven metrical feet